The Morphology and Structure of Stellar Populations in the Fornax Dwarf Spheroidal Galaxy from Dark Energy Survey Data

被引：33

作者：

Wang, M. Y. ^{[1
,2
,3
]}

de Boer, T. ^{[4
,5
]}

Pieres, A. ^{[6
,7
]}

Li, T. S. ^{[8
,9
]}

Drlica-Wagner, A. ^{[8
]}

Koposov, S. E. ^{[1
,5
]}

Vivas, A. K. ^{[10
]}

Pace, A. B. ^{[2
,3
]}

Santiago, B. ^{[7
,11
]}

Walker, A. R. ^{[10
]}

Tucker, D. L. ^{[8
]}

Strigari, L. ^{[2
,3
]}

Marshall, J. L. ^{[2
,3
]}

Yanny, B. ^{[8
]}

Depoy, D. L. ^{[2
,3
]}

Bechtol, K. ^{[12
]}

Roodman, A. ^{[13
,14
]}

Abbott, T. M. C. ^{[10
]}

Abdalla, F. B. ^{[15
,16
]}

Allam, S. ^{[8
]}

Annis, J. ^{[8
]}

Avila, S. ^{[17
]}

Bertin, E. ^{[18
,19
]}

Brooks, D. ^{[15
]}

Burke, D. L. ^{[13
,14
]}

Carnero Rosell, A. ^{[6
,7
]}

Kind, M. Carrasco ^{[20
,21
]}

Cunha, C. E. ^{[6
]}

D'Andrea, C. B. ^{[22
]}

da Costa, L. N. ^{[6
,7
]}

De Vicente, J. ^{[23
]}

Desai, S. ^{[24
]}

Eifler, T. F. ^{[25
,26
]}

Estrada, J. ^{[8
]}

Flaugher, B. ^{[8
]}

Frieman, J. ^{[8
,9
]}

Garcia-Bellido, J. ^{[27
]}

Gerdes, D. W. ^{[28
,29
]}

Gruen, D. ^{[13
,14
]}

Gruendl, R. A. ^{[20
,21
]}

Gutierrez, G. ^{[8
]}

Hollowood, D. L. ^{[30
]}

Honscheid, K. ^{[31
,32
]}

James, D. J. ^{[33
]}

Kuehn, K. ^{[34
]}

Kuropatkin, N. ^{[8
]}

Lahav, O. ^{[15
]}

Maia, M. A. G. ^{[6
,7
]}

Miquel, R. ^{[35
,36
]}

Sanchez, E. ^{[23
]}

机构：

[1] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

[2] Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundamenta, College Stn, TX 77843 USA

[3] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[4] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England

[5] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[6] Observ Nacl, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil

[7] Lab Interinst E Astron LIneA, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil

[8] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA

[9] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA

[10] Natl Opt Astron Observ, Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile

[11] Univ Fed Rio Grande do Sul, Inst Fis, Caixa Postal 15051, BR-91501970 Porto Alegre, RS, Brazil

[12] LSST, 933 North Cherry Ave, Tucson, AZ 85721 USA

[13] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, POB 2450, Stanford, CA 94305 USA

[14] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[15] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England

[16] Rhodes Univ, Dept Phys & Elect, POB 94, ZA-6140 Grahamstown, South Africa

[17] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England

[18] CNRS, UMR 7095, Inst Astrophys Paris, F-75014 Paris, France

[19] UPMC Univ Paris 06, Sorbonne Univ, Inst Astrophys Paris, UMR 7095, F-75014 Paris, France

[20] Univ Illinois, Dept Astron, 1002 W Green St, Urbana, IL 61801 USA

[21] Natl Ctr Supercomp Applicat, 1205 West Clark St, Urbana, IL 61801 USA

[22] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

[23] Ctr Invest Energet Medioambientales & Tecnol CIEM, Madrid, Spain

[24] IIT Hyderabad, Dept Phys, Kandi 502285, Telangana, India

[25] Steward Observ, Dept Astron, 933 North Cherry Ave, Tucson, AZ 85721 USA

[26] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

[27] Univ Autonoma Madrid, CSIC, Inst Fis Teor, E-28049 Madrid, Spain

[28] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

[29] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[30] Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA

[31] Ohio State Univ, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA

[32] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[33] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[34] Australian Astron Observ, N Ryde, NSW 2113, Australia

[35] Inst Catalana Recerca & Estudis & Avancats, E-08010 Barcelona, Spain

[36] Barcelona Inst Sci & Technol, IFAE, Campus UAB, E-08193 Bellaterra, Barcelona, Spain

[37] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

[38] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP, Brazil

[39] Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 881卷 / 02期

基金：

欧洲研究理事会; 美国国家科学基金会; 英国科学技术设施理事会; 澳大利亚研究理事会;

关键词：

galaxies: dwarf; galaxies: individual (Fornax); Local Group; STAR-FORMATION HISTORY; GLOBULAR-CLUSTERS; DSPH; EVOLUTION; DISTANCE; CARINA; CLUMP; TIP;

D O I：

10.3847/1538-4357/ab31a9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using deep wide-field photometry 3 yr data (Y3) from the Dark Energy Survey (DES), we present a panoramic study of the Fornax dwarf spheroidal galaxy. The data presented here-a small subset of the full survey-uniformly cover a region of 25 deg(2) centered on the galaxy to a depth of g similar to 23.5. We use these data to study the structural properties of Fornax, overall stellar population, and its member stars in different evolutionary phases. We also search for possible signs of tidal disturbance. Fornax is found to be significantly more spatially extended than what early studies suggested. No statistically significant distortions or signs of tidal disturbances were found down to a surface brightness limit of similar to 32.1 mag arcsec(-2). However, there are hints of shell-like features located similar to 20'-40' from the center of Fornax that may be stellar debris from past merger events. We also find that intermediate-age and young main-sequence populations show different orientation at the galaxy center and have many substructures. The deep DES Y3 data allow us to characterize the age of those young stellar substructures with great accuracy, both those previously known and those newly identified as possible overdensities in this work, on the basis of their color-magnitude diagram morphology. We find that the youngest overdensities are all found on the eastern side of Fornax, where the Fornax field population itself is slightly younger than in the west. In summary, the high-quality DES Y3 data reveal that Fornax has many rich structures and provide insights into its complex formation history.

引用

页数：14

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